JPH069841U - Work support device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a work supporting device capable of automatically correcting a centering error of a self-centering type steady rest 23 caused by a difference in a supporting outer diameter dimension. [Structure] A mounting base 17 provided with a fluid pressure cylinder 18 on a fixed mounting base 17 on a cross slide 15 capable of X / Z axis movement positioning, and a steady rest 23 fixed by a clamp piece 21 integrated with a piston 19. The clamp 22 is unhooked and unhooked, and after the work W is supported, it is clamped to automatically correct the misalignment error.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work supporting device having a center misalignment correcting mechanism of a self-centering steady rest.

[0002]

[Prior art]

 Conventionally, there is a cam type steady rest shown in FIG. 5 as a self-centering steady rest. In this device, three roller supports 101A to 101C for supporting the work W are opened and closed by the cam 102 so as to always be concentric with the work and are brought into contact with the outer circumference of the work. Therefore, it is possible to easily support various workpieces with different support outer diameter dimensions, and mount it on the cross slide 103 that can move and position the X-axis so that the center of the support is the core height of the spindle, and correct the X-axis of the steady rest support center. It is a work support device that can be used anytime if only the values are stored.

[0003]

[Problems to be solved by the device]

 In the work supporting device using the cam type steady rest of the prior art, the center of support is deviated and a misalignment error occurs each time the work supporting diameter changes due to a manufacturing error of the cam shape. The Y-axis misalignment error of the support center has little effect on the outer diameter machining size, but the X-axis misalignment error directly affects the machining size. Therefore, there is a problem in that the bolt 104 fixing the steady rest must be loosened once and then re-tightened, and the misalignment must be corrected by utilizing the gap between the bolt and the mounting hole. The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a work supporting device capable of automatically correcting a misalignment error. is there.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a work supporting device in the present invention is a work supporting device having a centering correction mechanism of a self-centering type steady rest, which supports the steady rest so as to be displaceable in at least a right angle direction of the work. And a means for clamping the steady rest to the mount by fluid pressure after the steady rest supports the work.

[0005]

[Action]

 In the unclamped state in which pressure fluid is not supplied to the fluid pressure cylinder, the work is supported by the self-centering type steady rest, then the pressure fluid is supplied to the fluid pressure cylinder, and the steady rest is clamped to the mounting base, Correct the misalignment error automatically.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. In the NC lathes of FIGS. 1 and 2, a headstock 2 is fixed on the left side of a bed 1, and a chuck 4 is concentrically fitted to the tip of a spindle 3 rotatably supported by the headstock 2. Two sets of Z-axis guides 1a and 1b are provided on the bed 1. A rear saddle 5 is movably mounted on the Z-axis guide 1a, and a front saddle 6 is movably mounted on the Z-axis guide 1b. Has been done. The rear saddle 5 is moved and positioned by the ZA axis motor 8 fixed to the bed 1, and the front saddle 6 is moved and positioned by the ZB axis motor 9. Furthermore, a tailstock 7 is mounted on the Z-axis plan 1b so that the position of the tailstock 7 can be changed, and a tailstock center 12 can be attached to and detached from the tip of the tailstock shaft 11 which is movable in the axial direction of the tailstock 7. It is installed.

An X-axis guide 5a is provided on the rear saddle 5, and a tool rest 13 is movably mounted on the X-axis guide 5a. The tool rest 13 is fixed to the rear saddle 5 by an XA-axis motor 14 Is moved and positioned by. An X-axis guide 6a is also provided on the front saddle 6, a cross slide 15 is movably mounted on the X-axis guide 6a, and the cross slide 15 is fixed to the front saddle 6 by an XB-axis motor 16a. Is moved and positioned by. A mounting base 17 is fixed on the cross slide 15, and a hydraulic cylinder 18 is bored in the mounting base 17 in the Z-axis direction.

The piston 19 of the fluid pressure cylinder 18 integrally has a rectangular clamp piece 21 at the tip, and the mounting base 22 having a groove 22a that engages with the clamp piece 21 can be displaced only slightly in the X-axis direction. A frame 24 of a cam type self-centering steady rest 23 is fixed to the mounting base 22. The steady rest 23 has a structure in which three supports 25A to 25C each having a roller 25a at the tip thereof are always in contact with a concentric circle of the work by the X-axis movement of a cam 25b integrated with the support 25A. You can use the one on the market.

Next, the operation of this embodiment will be described. In the state where the pressure fluid is not supplied to the fluid pressure cylinder 18, the front saddle 6 moves in the Z-axis to position the steady rest 23 at the steady rest position of the work W, for example, the central portion of the work W, and the cross slide 15 moves to the X position. It moves to the axial main shaft center side, and is positioned at a predetermined position where the support center of the steady rest 23 is concentric with the main shaft 3. Next, the supports 25A to 25C of the steady rest 23 are closed to support the work. At this time, the mounting base 22 and the mounting base 17 are in an unclamped state, and the steady rest 23 is slightly displaceable in the X-axis direction. Only the X-axis is displaced and the position is automatically corrected. In this state, pressure fluid is supplied to the front chamber of the fluid pressure cylinder 18, the clamp piece 21 is retracted, and the steady rest 23 is fixed to the mounting base 17.

[0010]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. The centering error of the support center of the self-aligning type steady rest is automatically corrected by the fluid pressure clamp means, so the misalignment error that occurs when supporting workpieces with different outer diameter dimensions affects the machining accuracy. It is possible to prevent adverse effects and significantly reduce the setup change time.

[Brief description of drawings]

FIG. 1 is a side view of a lathe with a work supporting device according to an embodiment.

FIG. 2 is a top view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional top view of the work supporting device.

FIG. 5 is a side view of a conventional work supporting device.

[Explanation of symbols]

1 bed 2 headstock 4 chuck 5 rear saddle 6 front saddle 7 tailstock 12 tailstock center 15 cross slide 17 mounting base 18 fluid pressure cylinder 21 clamp piece 22 mounting base 23 steady rest 24 frame

Claims (1)

[Scope of utility model registration request] 1. A work supporting device having a center misalignment correcting mechanism of a self-centering type steady rest, wherein a mounting base for supporting the steady rest so as to be displaceable at least in a direction perpendicular to the work is provided, and the steady rest is provided. A work supporting device, further comprising means for clamping the steady rest to the mounting base by fluid pressure after supporting the workpiece.